PHOTO: Bride-to-Be Chelsea Clinton on Crutches

Chelsea Clinton is walking on crutches and wearing a medical boot after breaking her heel, but a source tells PEOPLE she's expected to recover in time for her summer wedding to investment banker Marc Mezvinsky.

It's not known exactly how and when the former First Daughter hurt herself, but New Yorkers first spotted her using crutches on April 3, posting comments about it on Facebook and Twitter. – Sharon Cotliar